Telephone-exchange system



Sept. 21 1926. 1. 0.

s. a. WILLIAMS TELEPHONE EXCHANGE SYSTEI Original ed April 12 1924 6 Sheets-Sheet 1 5 EB H llmsmor: jam/d M/l/am Sept. 21 1926. 1,600,443

- S. B. WILLIAMS tsusraoussxcamer: svs'rsu Original Filed-April 2 1924 6 Sheets-Sheet 2 Sept. 21,1926. 1,600,443

- S. B. WILLIAMS TELEPHONE EXCHKNGE SYSTEM Original Filed April 12-. 1924 '6 fire/#081 jamue/ {Ml/lam:

Sept. 21', 1926.? I 5. B. WILLIAMS 'rsnsrnons Flxcxmuen sYsTEiI lm P 1924 e Sheets-Sheet 4 Sept. 21, 1926. v s. B. WILLIAMS TELEPHONE EXCHANGE SYSTEM Original Filed April 1 1924 6 Sheets-Shut. 5

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Patented Sept. 21, 1926. I r

UNITED STATES PATENT FFICE.

SAMUEL B. WILLIAMS, OF BROOKLYN, NEW YORK, ASSIGNOR To WESTERN ELECTRIC COMPANY, INCORPORATED, OE NEW YORK, N. Y., A'CORPORATIONOE NEW YORK.

TELEPHONE-EXCHANGE SYSTEM I Application filed April 12, 1924, Serial N6. 7013;014. Renewed April 5, 1926.

This invention relates to telephone exchange systems and particularly to such sys-.

tems as employ automatic switches in the establishment of connections.

192%, wherein a common controlling mecha-' nism of the marker type is used for controlling the operation of selector switches.

A number of so-called frame connectors are also provided for the purpose of placing the proper set of selector switches under the control of the marker, the choice of a particular frame connector being determined by the setting up of a record in the marker.

A feature of the invention, therefor, is the means for controlling the selection of the proper frame connector directly from conta ts of the sender selector switch.

Other features and advantages will be come apparent after aconsideration of the detailed description.

"Referring to the drawing, Figs. 1 to 5 when arranged in the Order shown in Fig. 7 disclose a suflicient portion of a telephone system to clearly illustrate the invention.

Fig. 1 discloses a line switch of the co ordinate type, and one of a number of outgoing trunks with associated controlling apparatus.

Fig. 2 illustrates one of a number of district selector switches, together with a number of outgoing trunks.

Fig. 3 shows a sender selector switch with its associated non-interfering starting circuit, and also an allotter switch for vpre-.

selecting an idle sender.

Fig. 4' to the leftof the a number of frame connectors and certain controlling circuits. To the right of the brokenline are shown a number of marker relays and a schematic diagram of the marker testing mechanism.

Fig. 5 to the left of the broken line shows a portion of a subscribers sender, while to the right of the'broken line is shown one of a number of sender connectors for conbrolre'n line shows Referring to Fig. 6, the subscribers lines 608, 609 enter the exchange andhave an appearance in a number of coordinate line switches 600. Outgoing from these line switches are a number of trunks 601, 602,

'etc., which terminate in district selector switches 610, 611, 612, etc. These district switches are arranged in a plurality of groups, one group being represented by switches 610 and 611 and another group by switches 612 and 613. The trunks outgoing from the line switches are shown distributed in an arbitrary manner among the different groupsv of district switches. A sender selector 620 causes-the association of an idle register sender as 630 with the calling line. When the designation of "the called line has been recorded on the register sender 630, a device 640 is operated to connect the recording sender with an idle one of the markers as. 650 for the purpose 0f transferring a portion of the record. There are alsojprovided a number of frame connectors 660 and 661, each of which may be associated with any markerand is individual to a group of district selector switches- Thus frame connector-661 is individualto the group of switches including switches 612 and 613) From, an inspection of Fig. 6, it will be apparent that the trunks outgoing from the line switches preserve the same grouping before the sender selector 620 as they do before the district, switches 610,612, etc. That is to say the vertical row ofycontacts 605 in the sender selector switch 620 corresponds to the group of district switches represented by switches 612 and 613. In a similar manner vertical row of contacts 606 corresponds to the group of'district switches represented by'swltches 610 and 611. g

Since the frame connectors 660, 661,etc.,

are accessible to anyv of the markers 650, V

651, etc. it.,beco mes imperative'that the proper frame connector be operatedcorrea line appears.

sponding to the particular group of district switches in which the extended calling Thus, if trunk 601 has been selected by a calling line, frame connector 661 must be operated, since trunkv 601 has an appearance only in the group of district switches with which frame connector 661 1s associated. Therefore, by identifying the particular row of vertical contacts of the sender selector switch 620 in which the selected trunk has an appearance, means is provided for selecting the proper one of the frame connectors 660, 661, etc.

The line switch 600, sender selector switch 620 and district selector switches 610, 612 etc, are of the coordinate type such as shown and described in the patent to S. B. Williams, No. 1,517,331, issued December 2, 1924..

Detailed description.

' \Villiams, thus causing'line 101 to be connected by means of a. horizontal link as link 102 with an idle outgoing trunk 120. At the same time ground is extended to the sleeve conductor of trunk 120, and thence through, the lower middle armature and contact of relay 112, normal contact of relay 111, conductor 150, to battery through the winding of relay 301 which corresponds to the line relay and is individual to trunk 120.

Relay 301 closes a locking circuit for itself,

through its right inner armature and contact, conductor 155, lowermost armature and contact of relay 112, lower middle armature and contact of the same relay to the grounded sleeve conductor of trunk 120. Relay 301 in operating connects ground through its rightouter armaturev and contact, conductor 156, to battery through the winding of slow release relay 111. Relay 111 operates and applies ground to the sleeve conductor of the trunk, thus providing a substitute holdin circuit for relay 301, and at the same time maintaining the connection through switch 100 as described in the patent to. S. B. Williams hereinbefore mentioned.

Relay 301 also connects ground through its left outer armature and contact, conductor 351,, right armature and back contact 3 of relay 303, to, battery through the winding of relay 302. It will be observed that the group of relays 302, 303 and is individual toa particular group of trunks represented by conductors 330 and conductors 331. Similarly the group of relays 332,, 333 and 334 is individual to asecond group of trunks. Relay 302 closes an. ol

. vious operating circuit for common relay 307. Assuming that no trunk in any other group 1s in the process of being associated with a sender, then all. relays similar to relay 302 are normal, and a circuit is closed from battery through the left hand winding of relay 304, left armature and front contact of relay 302, left armatures and back con tacts of intermediate relays similar to 302, conductor 352, right armature and back contact of relay 305 to ground at the armature and contact of relay 306. Relay 304 closes a locking circuit for itself through its right inner armature and front contact, winding of relay 305, to the above traced ground. Relay 305 operates in this circuit thus preventii'i simultaneous connections through the switch Relay 305 also closes an obvious operating circuit for slow-release relay 312. The operation of relay 304 also closed an obvious operating. circuit for relay 303 which looks through its left armature and contact, leftarmature and contact of relay 307, left armature and cont-act of relay 308 to ground, thus breaking the operatingcircuit of relay 302 which releases- When relay 304 closed its right outer armature and front contact, a circuit was completed from battery through the winding of Vertical operating magnet 309, right outer armature and front contact of relay 304, right armature and front contact of relay 305, to ground at the armature of relay 306. Magnet 309 attracts its armatures and prepares the vertical row of contacts 318 by actuating; rod 324. At the same time a circuit was closed to operate vertical magnet 310 associated with the vertical row of contacts 323 corresponding to a. preselected idle sender. The circuit for this purpose may be traced from battery through the winding of magnet 310, brush 320 of the allotter switch 350, armature and contact. of relay 311, conductor 353, left armature and contact of relay 306 to ground at the armature of relay Magnet- 310 attracts its armatures and prepares the vertical row of contacts 323 by actuating rod 326. At the same time ground is connected through the lower inner armature of magnet 310, conductor 550, brush 321 of the allotter switch 350, stepping magnet 355 to battery through the winding of relay 311. Switch 350 advances by means of this self-interrupting circuit-until a set of terminals is reached corresponding to the next idle sender, when the energizing! circuit for magnet is broken and switch 350 comes to rest. Mag- 312 is slow to release permitting the following operations to take place.

Assuming that link 341 is the first idle link in the group of links before which conductors 330 have an appearance, then a ciring of relay 313, left inner armature and contact of relay 301, conductor 354, left outer armature and contact of relay 304, left armature and contact of relay 327 to ground at the armature of magnet 309. Relay 313' closes a locking circuit for itself from battery through its left hand winding and left contact, left armature and back contact of relay 328, winding of relay 327 to ground at the armature of magnet 309. Relay 327 operates in this circuit. A circuit now is closed to operate horizontal magnet 314 associated with the idle link 341, from battery through the winding of magnet 314, armature and back contact of relay 315, armature and front contact of relay 316, right armature and front contact of relay 313, right armature and back contact of relay 328, right armature and front contact of relay 327 to ground at the right hand armature and contact of relay 306. Magnet 314 operates in this circuit and completes the connection from the set of conductors 330 through horizontal link 3 41 to the set of conductors 360 leading to the selected sender. lVith the switch 300 operated the ground at the contact of magnet 310 is extended through the contacts of switch 300 conductor 153 to battery throughthe winding of relay 112. Relay 112 operates thus connecting the calling line directly through the sender selector with the selected sender.

hen relay 312 releases subsequent to the operation of horizontal magnet 314, the holding circuit for relays 304 and 305 is broken and these relays now release in turn releasing magnets 309 and 310 and relay 306, the connection through the switch 300 being maintained by horizontal magnet 314 in the manner described in the patent to S. B. \Villiams above mentioned. Shoulc another trunk be awaiting connection through switch 300 while the foregoing operations were taking place, relays 333 and 334 corresponding to this latter tinnk are operated and relay 303 corresponding to the first mentioned trunk remains locked through its left armature and contact, to ground at the left inner armature and contact of relay 334, thus preventing a second trunk in the same group of trunks represented by conductors 330, being connect-er through switch 300 before waiting connections in other groups have been so completed. Should, however, a connection be waiting in the first-mentioned group, all intermediate relays similar'to relay 302 are released and a circuit is closed for relay 308 through the left armatures and back contacts of these relays in series, conductor"352 to ground through the right armature and back contact of relay 305.- The operation or relay 308 opens the holding circuit of relay 303 which now releases, and permits other trunks in group, represented by con ductors 330, to be connected through switch 300 with anidle sender.

When magnet 309 opera-ted it connected ground through its lowermost armature and contact, conductor 353, connecting block 370,

conductor 357 left normal contact of relay 503 to battery through the winding of relay 511. At this point it will be observed that the armatures of certain of the vertical magnets as 309 and 339 are cross connected by means of block 370 to the winding of frame identifying relay 511 while the corresponding armatures of other vertical'magnets,'as magnet 338 are left blank for purposes hereinafter described. 1

As soon as connection was completed through switch 300, an impulsingcircuit was closed from battery through the winding of relay 502, conductor 359, contacts of switch 300, conductor 152, ring side of the trunk 120, contacts of lineswitc-h 100, through the snbscribers loop, back over the tip side of the line, contacts of switch 100, tip side of the trunk, conductor 151, conductor 358 to ground through the winding of retardation coil 539. Relay 502 operates in thiscircuitand closes obvious operating circuit for slow release relay 503. Relay 503 applies holding ground to conductor 550 to take the place of the ground which is removed when magnet 310 releases. Relay-503 also closes through its left armatures an obvious holding circuit for the identifying relay 511, this latter relay beingnow maintained energized independently of 'erticalmagnet 309. P

he callingsubscriber now dials the designation of the wanted line, setting up a. corresponding record on the registers A, 13,0, etc.

in the manner described in detail in the'above mentioned patent to S. B. Williams. After the dig ts have been thus recorded, relay 512 operates and completes a circuit from.

ground through its armature and contact, upper winding of relay 504 to battery at the right outer armature and contact ofrelay Relay 504 operates and completes a locking circuit for itself 1 series with-the winding' of relay 'Relay505 also operates, thus preventing more than one sender being connected simnltaneensly, -thi,"ough contacts of sender-connector 500,-.with the marker. T 'opera utzon of relay 505 also closes circuit from ban throughthe winding of magnet 513, in oerarinature and contact of relay 5044mm;

contact of relay to ;.r armature and 0 id the armature of relay 505; lea a 513 completes an obvious locking "circuit for itself to ground at the left armature of relay 505.

It will be observed that the gro ip of con-v the next idle marker.

aboveductors, as 560, leading to a marker, have an appearance in a: particular row of contacts in the sender connector 500. Thus, the con ductors 560, which are'individual to the marker shown in Fig. 4, have an appearance in vertical row 514. In a. similar manner, a corresponding set of" conductors, as 561, leading to another marker are shown terminating in a vertical row of contacts 501 andv 507 operated, a circuit is closed for operating. magnet 517 from battery through it's winding, lower middle armature and con tact of relay 501 to ground at the left outer armature and contact of relay 507. The operation of magnet 517 connects the set of conductors 560 directly with the register sender, allowing the recorded designation to be transferred tothe selected marker in the manner described in the previously mentioned patent to S. B. Williams. Relay 507 also closes a circuit through to lower contact of relay 501," for operating the cutoff relay 520.

-I'f when relay 504 operates, the marker associated with conductors 560 is busy, then relay 509 is operated and a circuit is closed to operate starting relay 510 associated with The circuit for this purpose may be traced from battery at the left inner armature and contact of relay 5.18,. upper winding of relay 510, lower armature and back contact of relay 516, lower armature and back contact of relay 522, upper armature and contact of relay 501, locking contact and armature of relay 509, lower armature and front contact of relay 504 to the grounded conductor 521 through the right outer armature and contact of relay 520. The operation of relay 510 causes the successive energization of relays 518 and 516 and magnet 519, thus allowing the record set up on registers 600, 601, etc. to be transferred over the set of conductors 561 to the corresponding marker.

It will be remembered that when the sender selector vertical magnet 309 operated, ground was connected by means of the cross-connecting block 370 to the winding of frame identifying relay 511. lVhen, therefore, marker relays 410 and 411 operate as a result of the marker being seized, as described in the patent to S. B. Villiams, identified, ground is connected through the; left outer armature andcontact of relay 410, conductor 451, contacts of sender connector 500, the right armature and front contact of relay 511, contacts of the sender connector 500, conductor 452, left inner armature and contact of relay 411, Winding of starting relay 412, to battery at the armature of relay 421. Relay 412 operates in this circuit. If some other sender selector vertical magnet, as 338, whose armature is not cross-connected to the winding of relay 511 has been operated, relay 511 would be normal and the above traced groin-id would in this case be extended through the right armature and back coir. tact of relay 511 to cause the operation of a different starting relay, as 413, associated with a second frame connector. It is evident, then, that by using a number of relays similar to frame identifying relay 511 the operation of certain sender selector vertical magnets will cause the operation of the corresponding frame connector starting relays similar to relays 412 and 413, thus causing the selected marker to be associated with the proper group of selector switches in which the selected trunk appears.

When relay 412- operates, a circuit is completed from battery through the lower winding of relay 414, upper armature and front contact of relay 412, right armature and back contact of relay 417, to ground at. the armature and contact of relay 416. By means of the series circuit through the armature and contact of relay 412, no other relay similar to relay 414 can be energized, thus preventing simultaneous connections through the frame connector 400. A circuit is now completed through the slow release relay 416 from battery through its winding, left arma ture and back contact of relay 417, lower armature and contact of relay- 414 to ground at the inner armature and contact of relay 410. Relay 416 attracts its armatures and completes an obvious locking circuit for re: lay 414 in series with the winding of relay 417. Relay 417 operates in this circuit and opens the energizing circuit for relay 416. Vhen relay 416, which is slow-acting, has released, relay 418 operates from battery through its winding. uppermost armature and contact of relay 414, right armature and front contact ofrelay 417 to ground at the armature and Contact of relay 416.

lVhen marker relay 419 operates, as described in the above mentioned patent to S. B. \Villiams, ground is extended over conductor 450 through the contact of switch 300, conductor 158, armature and contact of relay 114, conductor 157 to battery through the winding of vertical magnet 210. Magnet 210 operates and connects ground through its lower armature and contact, conductor 240 to battery through the winding of frame connector relay 420. With relays;

418 and 4:20 operated, the group of conductors 250 individual to switch 200 in which the selected trunk 120 has an appear ance, are connected through contacts of frame connector 400 to the marker testing mechanism 470 of the marker.

The switch 200 is now associated directly with the marker and tests are therein made in the manner described in the above-mentioned patent to S. B. Williams, resulting in the operation of a trunk vertical magnet as ll, and a horizontal connecting magnet as 220.

The further extension of the calling line, and the subsequent release 01": the connection are accomplished as described in the cited lVilliams patent.

lVhat is claimed is:

1. In a' telephone system, a number of lines, a plurality of groups of selective switches, means for extending said lines to said switches, a controlling mechanism or said switches, an automatic switch for extending said lines toward said controlling mechanism, a connector for each group of selective switches, each connector arranged for operation for connecting said mechanism to the switches of the corresponding group, means responsive to said automatic switch in its operation for selecting one of said connectors to be operated, and means controlled by said mechanism for selectively operating the selective switch to which such mechanism is connected.

2. In a telephone system, telephone lines,

connect said mechanism to the corresponding selective switch, discriminating means operable accordlng to tlIG OPGI'ELUOH of said operating members, means controlled by said I ating said members to cause said lines to be associated with said mechanism, connectors each related to a diflerent one of said selective switches arranged to connect the controlling mechanism with such switch, means variably operable in accordance with which one of said operating members is taken for use for selecting one of said connectors for operation, and means governed by the controlling mechanism for selectively operating the selective switch to which such mecha nism is connected.

4. The combination with telephone lines of a number of selective switches, means for extending said lines to said switches, a register sender, a sender selector-switch for extending SflldllDGS to said sender, a switch controlling marker, a connector for each selective switch, connectors each related to a different one of said selective switches arranged .for operation for connecting said marker to the vcorresponding selective switch, means for associating the sender with the marker, means responsive to the sender selector for determining which one or" said connectors is to be operated, and means'controlled by the marker through the connector for governing the operation of the selective switch with which said marker is associated.

In witness whereof, I hereunto subscribe my name this 9 day of April A. D., 1924. SAMUEL B. WILLIAMS.

. lines appearing in each row, means for oper- 

